A convex lens has a focal length of 10 cm. At which of the following position should an object be placed so that this convex lens may act as a magnifying glass ? (a) 15 cm (b) 7 cm (c) 20 cm (d) 25 cm

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Solution

(b) 7cm because for acting as a magnifying glass, the object should be real close to it, i.e. within the focal distance.

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Similar questions

Q. A convex lens has a focal length of 10 cm. At which of the following position should an object be placed so that this convex lens may act as a magnifying glass?

(a) 15 cm
(b) 7 cm
(c) 20 cm
(d) 25 cm

A convex lens has a focal length of 10 cm. At which of the following positions should an object be placed so that this convex lens may act as a magnifying glass?

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Q. (a) What type of lens is used as a magnifying glass?
(b) What type of lens is used to correct the defect of vision called myopia?
(c) A convex lens has a focal length of 10.5 cm. Where should an object be placed in front of this convex lens so as to obtain an image which is real, inverted and same size as the object?

Q. An object is placed at the following distances from a convex lens of focal length

10 c m

.
(a)

8 c m

(b)

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(c)

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(d)

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Which position of the object will produce ..............
i) a diminished, real and inverted image ?
ii) a magnified, real and inverted image ?
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iv) an image of same size as the object ?

Justify your answer in each case.

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